Question

8. The element A,B,CD and E have atomic numbers 9, 11 .17, 12, and 13 respectively.
Which pair of elements belong to the same group.

A. A and B

B. B and D

C. A and C

D.D and​

Answer 1

c is the answer

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group ? Elements which differ in atomic numer by 8 i.e., 9 (A fluorine) and 17 (Cl, chlorine) lie in the same group i.e., group 17 (halogens).

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Answer 2

Answer:

a and c

Explanation:

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